Carving-machine.



No. 850,941. PATBNTBD APR. 2a, 1907.

B. R. LOGHMAN. l

GARVING MACHINE.

' Arrmouron FILED JAN. z, 190s.

ATTORNEY 110.850,941. l PATENTBDAPR.2a,19ov.

' B.R.L00HMAN. .Y v

1 GARVING MACHINE. APPLICATION FILED JAN.'2, 1903.

2 SHEETS-SHEET 2.

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In'rnnfr OFFIOE.

EMIL R. LOOHMAN, Or ST. LOUIS, MISSOURI.

CARVING-NIACHINE.

Specification of Letters Patent.

Patented April 23, 1907'.

Application led January 2,1903. Serial No. 137,529.

To @ZZ zul/1,0777, t may concern:

Be it known that l, EMIL R. LOOIIMAN, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain `new yand useful Improvements in Carving-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.'

My invention has relation to improvements in carving-machines; and it consists in the novel construction and arrangement of parts more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a perspective view of a section of the machine, showing my improvement attached thereto. Fig. 2

is a side elevation of the outer swinging frame of the machine. Fig. 3 is a section on line3 3 of Fig. 2, and Fig. 4 is a section on line 4 4 of Fig. 2.

The present invention is an improvement on carving-machines provided with one or more swinging frames or parallelograms, said improvement being particularly directed to thebelt connections between the main driveshaft and the tool-spindles, tothe means for imparting the necessary tension thereto, and to the means for insuring a high velocity to the tool-driving belt without subjecting the same to unnecessary torsional strain. In the general class of machines of'this type a single belt connection is interposed between the main drive-shaft and each tool-spindle', the

llaps of the beltA passing around guide-pulleys mounted on a bracket which is suspended on the post about which the outer frame of the machine revolved. Under this arrangement the path of vthe drive-belt becomes unduly circuitous, necessitating the travel of the belt around corners and numerous bends and subjecting the same during the travel thereof to variable degrees of torsion. This torsional strain, vcoupled with the high velocity vto which such a belt is necessarily subjected,

has the effect of shortening the life thereof, and often during the running of the machine the belt would part and entail both `a loss ofv I tion disposed betweensaid post and the :free end of the outer frame, said outer section being herein designated as the Htool-driving belt and traveling at a higher velocity. The tool-driving-belt sections are made lighter than the .inner belt-sections, the tighteners being applied directly thereto, the heavier material of which the inner sections are comtighteners. ln detail the invention may be described as follows:

Referring to the drawings, 1 represents Athe upper supporting-bracket for the support of the inner vertical swinging frame 2. Pivotally mounted between the outer or free ends of the upper and lower members (not shown) of the inner frame isthe angular post 3 said post constituting the pivotal axis about which the outer frame of the machine lrevolves. This outer frame (or extension) comprises the post 3 referred to, a series of vertically-Oscillating arms 4, (only the* top one of which is shown,) pivotally embracing the post 3 at approximately their medial portions, the rear connecting-post 5, and the front tool-supporting beam 6. In the particulars mentioned the present `machineoonforms to machines of a class well known in the art,and no detailed description thereof is required. Like in machines of this class the main drive-shaft 7 is concentric with the axis of oscillation of the inner frame and has disposed thereon belt-pulleys 8, corresponding in number to the number of tools 9, (only one tool being herein shown,) carried bythe beam 6. Pivotally secured to the inner face lof one of the walls (the wall which is ,parallel to the plane of oscillation of the arm 4) of `the post 3 is the inner endof a bar l0, said endhaving deflected therefrom a bracket 1l, serving as a support for the spindle of the step-pulley 12. Over the smaller periphery of the pulley 12 is passed the inner Vbelt-section 13, leading from the belt-pulley 8, and over the larger periphery isfpassed theouter belt-section 13', leading tothe pulley 14 ofthe toolspindle, the belt 13 previously passing through `the pulley-block 15, as inthe previous class of constructions referred to. `The arm 4 by alink 16, whose point of connection with the bar 10 is at a slight distance from the Outer end of the latter. The point of connection of the bar 10 with the post 3 is slightly in advance of the vertical plane passed through the axis of vertical oscillaposed dispensing with the necessity of rbeltbar 10 is pivotally coupled to the adjacent IIO tion of the arm 4, so that a line drawn from such point of connection along the wall of the post 3 to the axis of vertical oscillation of the arm 4 wouldbe slightly inclined from the vertical, the link 16 being substantially parallel to such a line, Fig. 2. The link 16, arm 4, bar 10, and so much of the post 3 as is included between the point of connection of the bar therewith and the axis of vertical oscillation of the arm 4 constitute a parallelogram of pivoted links which is free to fold and unfold, according to the degree of vertical oscillation imparted to the outer frame.

The specific location of the point of connecpost 3 brings the axis of rotation of the steption between the bar 10 and post 3 is made necessary, owing to the slight distance that the axis of rotation of thc tool-spindle occupies in advance of the point of connection of y the arm 4 with the tool-supporting beam 6 otherwise the parallelism of the sides of the parallelogram would not be conserved during the vertical oscillations of the arm 4.

The outer end of the bar 1() has formed I therewith the ratchet-disk 17, disposed at right angles to the plane of oscillation of said bar, the middle of the ratchet supporting a stud 18, about which is mounted the boss of an arm 22, about which boss is coiled the body of the belt-tightener spring 19, one end of the latter being secured to a pawl 20, engaging the ratchet-teeth, and the opposite end of a lug 21 on the under surface of said arm, the latter being freely rotatable about the stud and the free end of said arm 22 carrying a pulley 23. To wind up the spring, either the pawl 20 can be run along the teeth of the ratchet or the arm 22, carrying the pulley, can be swung in the opposite direction to produce the same result.

The connection between the bar 10 and pulley 12 substantially in line with (slightly to one side of, in reality) the axis of rotation of the post, so that the oscillation of the pulley in a vertical plane to which it is subjected for any vertical sweep of the arm 4 cannot materially disturb the travel of the inner As to the outer belt-section, the disposition thereof relatively to the pulley 12, pulley 14, and tightener-pulley 23 vis not disturbed during any vertical oscillation of the outer frame, since the parallelogram of pivoted links referred to always preserves the several parts in constant relationthat is to say, the bar 10 oscillates parallel to the arm 4, the planes of rotation between the several pulleys are preserved in constant relation, the belt-tightener following the outer belt-section in all its oscillations and permitting the belt to travel at an increased speed over the inner belt-section, and this without subjecting the outer belt to any torsional strain under any circumstances.

Thus it will be seen that all the advantages speciiied above are inherent in the present construction. The series of tools at the free end of the outer frame may of course be any number from one up, and the expression f series of tools7 as used in the claims is to be interpreted as covering oneA or more tools.

Having described my invention, what I claim is- 1. In a carving-machine, a frame swinging about an axis, a tool at the free end of said frame mounted to oscillate in a plane parallel to said axis, a pulley mounted substantially in the line of the axis of the frame, the axis of the pulley being capable of oscillation in a plane parallel to the plane of oscillation of the tool aforesaid, a belt-tightener coupled in position near the axis of said pulley and oscillating in unison therewith, and a belt-section leading from the pulley to its corresponding tool-spindle, substantially as set forth.

2. In a carving-machine, a frame swinging about an axis, and adapted to sweep in planes parallel to said axis, a tool at the free end of said frame, a pulley mounted substantially in the line of the axis of the frame, the axis of the pulley beingA capable of oscillation in a plane parallel to the planes of the sweep of the frame, a belt-tightener coperatively connected with the pulley and oscillating in unison therewith, a link connecting said tightener with the frame, and a belt-section leading from the pulley to its corresponding tool-spindle, substantially as set forth.

3. In a carving-machine, a suitable frame swinging about an axis, a second frame swinging on said frame about a second axis, a tool at the free end of the second frame adapted to sweep in a plane parallel to said second axis, a drive-shaft located in the line of the axis of suspension of the first frame, a steppulley for the tool located at the axis of suspension of the second frame, said pulley being adapted to oscillate about its axis of rotation in planes parallel to the sweep of the tool aforesaid, an inner belt-section leading from the drive-shaft to the smaller periphery of the step-pulley, and an outer belt-section leading from the larger eriphery of the step-pulley to the tool-spindle, substantially as set forth.

4'. In a carving-machine, a suitable frame swinging about an axis, a second frame swinging on said frame about a second axis, a tool at the free end of the second frame adapted to sweep in a lane parallel to the second axis, a drive-shaft located in the line of the axis of suspension of the first frame, a steppulley for the tool located at the axis of suspension of the second frame, said pulleyv being adapted to oscillate with its axis of rotation in planes parallel to the sweep of the tool aforesaid, an inner belt-section leading from the drive-shaft to the smaller periphery of the step-pulley, an outer belt-section leading from the larger periphery of the step-pullOO IIO

ley to the tool-spindle, and a belt-tightener for the outer belt-section coupled to the steppulley and oscillating in unison therewith, substantially as set forth.

5. In a carving-machine, a suitable frame swinging about an axis, a second frame swinging on said frame about a'second axis, a tool at the free end of the second frame adapted to sweep in planes parallel to said second axis, a drive-shaft located in the line of the axis of suspension of the iirst frame, a steppulley for the tool located at the axis of suspension of the secondframe, the axis of the pulley being free to oscillate in planes parallel to the swee of the tool, an inner beltsection leading 'rom the drive-shaft to the smaller periphery of the step-pulley, an outer belt-section leading from the larger periphery of the steppulley to the tool-spindle, a swinging bar coupled in position about the axis of the ulley and adapted to oscillate in unison, ancFin a corresponding plane, therewith, a link connecting said bar to the second frame, and a belt-tightener for the outer beltsection carried by said bar, substantially as set forth.

6. In a carving-machine, a suitable frame swinging about an axis, a second frame swinging on said frame about a second axis,

3o the tool at the free end of the second frame adapted to oscillate in planes parallel to said second axis, a drive-shaft located in the line of the axis of suspension of the first frame, a bar opposite the tool, pivotally connected about the axis ofifususpensionfofgthe second frame, a bracket carried by said bar, a steppulley mounted on said bracket and having its axis disposed substantially in the line vof the axis of suspension of said second frame, a ratchet at the outer end of the bar, a stud on said ratchet, a spring coiled about the stud, an arm swinging about the stud, a tightening pulley on the free end of said arm, one end of the spring engaging the ratchet and the other end being secured to the swinging arm, a link coupling the bar pivotally to the outer or second frame, an inner beltsection leading from the drive-shaft to the smaller periphery of the step-pulley, and an outer belt-section leading from the larger periphery of the steppulley to its corresponding tool-spindle, the tightening-pulley engaging one lap of the outer belt-section, substantially as set forth.

In testimony whereof I .aflix my signature in presence of two witnesses.

EMIL R. LOCHMAN.

Witnesses:

EMIL STAREK, G. L. BELFRY. 

